South Korea's national security adviser Chung Eui-yong has returned from China and Russia after briefing on his recent meetings with the leaders of North Korea and the U.S.

Arriving in Incheon International Airport from the three-day trip on Thursday, Chung told reporters that the leaders of Beijing and Moscow greatly welcomed the positive developments on the Korean Peninsula and the mood of reconciliation and cooperation between the two Koreas.

Chung said that the leaders also appreciated President Moon Jae-in consistently sticking to his principle that the denuclearization of the Korean Peninsula must be realized peacefully through dialogue.

The security adviser said that he conveyed Moon's gratitude for the Chinese and Russian leaders' constructive roles in efforts to settle peace and stability on the peninsula.